Improvement is maghiie foe grinding



@einen gisten' stnt- @ffice EDWARD Neuron', or'B'oSToN, MASSACHUSETTS( Letters Patent No. 77,646, dated May 5, 1868.

zitte ttehnle referrer fr in figue tetirs rlnrt mit mating out ai its tame.

TO ALL WHOM IT MAX CONCERN:

l Be it known that I, EDWARD NORTON, of Boston, inthe county of Suffolk, and State of Massachusetts,

have invented certain new and' useful Imprdvements in Machinery for-,File-Grinding; and I do hereby declare that the following is a full. and, exact description thereof, reference being had to the accompanying drawing, and to the letters ofvreference marked thereon. A

The drawingrep'rescnts a perspective view of a machine embodying the several -features of my improvement. Like letters refer to the same or corresponding parts. Y Two grindstones, a, a're suspended 'in bearings in the pendulous hangers b, so as to swing toward and from -the grinding-peripheries of each other.` The pendulous hangers bare hung'on bearings 2, which are susceptible yof adjustment toward and from each other, so that positions may be given them which will enable-the operator to avail :of the weight'of the lgrindstmes, dto., to move them from each other or the work to be ground. r A weight, c, acting through suitable connections, as levers d and chains e, serves to move and hold the grindstoncs towardfeach other, or the\,w`ork to be ground, with ayielding force or pressure. The chains or connections c are adjustable, for the purpose of adjustingthe relation of the levers d or weight c to the 'required relative positionoi` the stones a, the two chains e being connected to each'lever d.' n

The lower ends of the pendulous hangersb are properly guided in their -movements by means of rollersf in their lower ends. Pulleys g, on the grilndstonefshafts, receivethe belts for driving-the stones, and L is a 4suitable trough for the' stones to work in,and for containing water, Etc. .The stones revolve in the directions indicated by the arrows, and the file or other blanks g are arranged for grinding within Athe frame 2', between them.

r v i The frame z' hangs on lrollers j in the carriage, support, or cross-head 7c, which receives a reciprocating y lmovement, up and down, by means of the connectinglrod Z and the crank m. It also has a projection, playing in the inclined ways 1t, which gives it, from the upiand-down movement, a traversingmovement, with the blanks it carries, transversely to the plane of 'revolution of the grindstones'. The movement up and down, or longii tudinally to "the blanks, is for bringing all points in the length of. the blanks to the action of the stones. 'Ehe transverse movement is to equalize the grinding act-ion upon -the surface of the blanks, and to prevent furrow-x ing the stones. The wrist-pin in the crankfarn'i` mis adjustable, for the vpurpose of regulatingtho throw to correspond to the length of surfacesl tobe ground, and the connecting-rod lis adjustable also as to length, so as to give the frame carrying the blanksto be ground a proper elevation with reference to the stones point of action. l

'Ihe action of the grind'stones, with reference to grinding surfacesI to the proper form and thickness, is controlled by means of a pattern, p, ofthe required form yto be-ground. The pattcrnp is ixed to thc carriage le, and thereby has a movement upa'nd down,.corresponding to the movement of the .blanks g. This pattern Imoves between a fixed roller, s, and a'movable one, t, The movable one has suitable bearings in guides, and i is connected to chain u and the weight c, so that, as therpattern mov'c'svbetween the rolls, from its thin to its thick part, the roll f rcceives a movement' thereby?, which, through connection u, raises the weight c and levers ,'and'allows'the pendulous hangers b, with the stones u, to recede and leave a corresponding thickness to the .blanks in process of grinding. 4When thepatt'ern moves between the rolls from the thick to the thin portion, the roll t follows, and so allows weight c to rccedeor fall, thereby, through connections c, drawing the pendu: lons hangers b and stones a toward cach other, so as to conform to the lesser required thickness.

The weight, controlled in its action by the pattern,ys`ecures a force for application to thestones which is r Anot rigid, likea screw or other positive movement, while, on the other hand, the pattern furnishes a compara# tively rigid limit in determining the positive grinding action of the stone upon the form or thickness of the article in process of grinding. Springs may be substituted Afor the weight, if preferred, and without material modification of the machine.

The frame or holder carrying the blanks q which are to be ground, is a detached one, and is removable f from the carriage le by simply lifting olf from the rollers j, so that the operator may have two'or more of these frames t', and whieheisgrinding one fr'ame'full he may be'lling'the other, or' inspecting the last; thus no time will be lost in filling the frames. i l

Ahand or foot-connection to the weight lc and levers d is provided'in lever w and connection fr, by which the action of the stones may be controlled, independently :of the pattern was occasion may require.

'When only one stone is used, as in grinding but one sideof the work, a roller may be substituted for the other driven stone.

I will also further explain that the pendulous hangers may be inverted, so a's to convert'them into rocking or oscillating-stands, and without essential modificationV of other'portions of they machinery, and I intend to olaimmy improvements,iwhether inverted or otherwise.

Motionl may be communicated to the crank-arm 'm by a belt applied to pulleys y, or otherwise. The best materials for the construction of-.the machinery, suchssiron, steel, wood, 82e., need not be further specied, as the appropriate ones will naturally suggest themselves.

Thus, having described the several features ofmy improvements so fully as to yenable those skilled-in the art to comprehend, construct, and apply lche same in a practically-working machine', what I claimas my inven tion, and: desire to secure by Letters Patent, is :1s-follows: i Y

41. I claim the employment of afpendulou's or Aoscillating hanger or standpn combination with the axis Ioi': a grinding-stone, arranged parallel toits own axis of oscillation, or equivalent device, substantially as described.

2f I claim the.`arrangement of th'e oscillating grinlistone-stand or hanger, with an inclination from its supporting and oscillation-axis toward the work to be ground, so that the weight of the stone and hanger may' be employed to eiect all movements of the stone inthe opposite direction, substantially'as shown.`

8. Iclaim, in combination with', the inclined arrangement of'framc for` moving. the stone in one direction, the arrangement of 'a weight, c, or spring, to `move it in the opposite direction, substantially as set forth.

4. I claim the frame z'for its-equivalent, operating vsubstantially as 'and for the purposesset forth.

5. I claim the employment of the adjustable connecting-rod Z, in combination with-the crank'm and the carriage c, and operating substantially as. andV for the' purpose set forth. Y l l YEDWARD NGRTON. Witnesses.'

' Inn D. SPAULDING,

JOSEPH H.. LEWIS. 

